tailieunhanh - Sm3+ Doped Borotellurite Glass: Absorption, Fluorescence and Optical Parameters

Borotellurite glasses doped with Sm3+ ions were prepared by a melt–quenching technique. The studies on optical characterization of Sm3+ ions have been carried out through absorption, emission and decay spectra. Judd-Ofelt (JO) intensity analysis has been presented and JO parameters were calculated for Sm3+ ions in borotellurite glasses. Radiative properties such as transition probabilities, branching ratios, radiative lifetime of 4G5/2 level and quantum efficiency were estimated by using JO parameters. | VNU Journal of Science: Mathematics – Physics, Vol. 34, No. 1 (2018) 33-39 Sm3+ Doped Borotellurite Glass: Absorption, Fluorescence and Optical Parameters Phan Van Do* Thuy Loi University, 175 Tay Son, Dong Da, Hanoi, Vietnam Received 19 January 2018 Accepted 05 February 2018 Abstract: Borotellurite glasses doped with Sm3+ ions were prepared by a melt–quenching technique. The studies on optical characterization of Sm3+ ions have been carried out through absorption, emission and decay spectra. Judd-Ofelt (JO) intensity analysis has been presented and JO parameters were calculated for Sm3+ ions in borotellurite glasses. Radiative properties such as transition probabilities, branching ratios, radiative lifetime of 4G5/2 level and quantum efficiency were estimated by using JO parameters. Keywords: Borotellurite glasses, Judd-Ofelt theory. 1. Introduction Glasses doped with various rare earth ions are important materials for making fluorescent display devices, optical detectors, lasers, optical fibers, waveguides and fiber amplifiers [1-4]. Spectral properties of rare earth ions in glasses vary in a wide range depending on the chemical composition of glass former and modifier [3, 4]. Among lanthanides, the Sm3+ ion is one of the most interesting ions for analyzing the fluorescence properties because it is widely used in the fields such as undersea communications, high-density memories, colour displays and solid-state laser [2, 5-8]. Boric oxide (B2O3) is one of the representative glass former and flux material among the characteristic networks former [2]. Borate glasses have been extensively investigated due to intriguing properties such as good transparency in the infrared, low melting point, high solubility of rare earth [24, 8]. The disadvantage of these glasses is that high phonon energy (around 1300-1500 cm-1) results in strong occurrence of multi-phonon and reduces the luminescence efficiency of the material [3, 4, 6, 7]. The phonon energy of TeO2 is about 750